Yes; if angle of incidence is zero angle of refraction is zero regardless of index:
sin theta r = (n1/n2) sin theta i
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That it has a 90 degree angle and two equal 45 degree angles
The [horizontal] range of a projectile is maximised when it shoots at a 45 degree angle. This is true if air resistance is ignored so that the only force acting on the projectile is gravity.
The longest side is twice as long as the shortest side.
true or false ? perpendicular lines intersect at an angle of 45
True